@SequenceGenerator on class annotated with @MappedSuperclass

Question

I have following structure of my entities:

@MappedSuperclass
public abstract class BaseEntity {
  @Id @GeneratedValue(strategy = GenerationType.SEQUENCE, generat         


        

Answer 1

I ran into the same problem described in this question while trying to achieve application wide id generators.

The solution is actually in the first answer: put the sequence generator on the primary key field.

Like so:

@MappedSuperclass
public abstract class BaseEntity {
  @Id
  @SequenceGenerator(name = "seqGenerator", sequenceName = "DICTIONARY_SEQ")
  @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "seqGenerator")
  private Long id;
}

@MappedSuperclass
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
public abstract class Intermed extends BaseEntity {}

@Entity
public class MyEntity1 extends Intermed {}

@Entity
public class MyEntity2 extends Intermed {}

While doing things this way seems remarkably stupid (at least to me) it does work.